[D2L] Piping & Pressure

Question 1

Typical pressure in a gas main is carrying natural gas at 0-150 psi

T or F

Answer 1

False, It’s 12-80 psi

Question 2

Typical natural gas pressure in the finish piping (inside the building) is:

Answer 2

7-14” WC

Question 3

Typical natural gas pressure in the manifold piping (inside the appliance):

Answer 3

3-4” WC

Question 4

A pressure test gauge used to test gas piping must have a minimum of _____” diameter

Answer 4

3”

Question 5

After the installer completes the finish piping connections to an appliance, the finish piping must be tested for a duration of _____ with an approved leak detector

Answer 5

10 minutes at working pressure

Question 6

A column of water 14” high will exert a pressure of

Answer 6

0.5 psi, because 28” WC is equal to 1 psi

Question 7

Where would a technician measure manifold pressure from?

Answer 7

Downstream of the gas valve

Question 8

Normal propane building supply pressure to a residential building would be 11”

T or F

Answer 8

True